I highly recommend Paula’s place. The location of the apartment is really great, in the middle of Bangkok close to the BTS and in a road with loads of great restaurants but the area around the apartment is still very quiet and you can relax easily at the pool and the nice garden.
The room and the apartment are also very nice with a great bed, fast wifi, a nice kitchen, your own bathroom and a washing machine.
Paula is a really friendly and very interesting person. She can give you many tips where to go and what transportation to use in Bangkok. She also knows a lot of stuff about the rest of Thailand, or Asia or even the whole world and loves to share it with you :)